The documentation of MongoKit, "a python module that brings structured schema and validation layer on top of the great pymongo driver. It has be written to be simpler and lighter as possible with the KISS and DRY principles in mind."

PlayNice.ly is entirely based on a data-structure server called Redis. Redis is one of several new key-value databases which break away from traditional relational data architecture. It is simple, flexible, and blazingly fast. So why not use the tools we have already?